Multi-Channel Funnels are truly awesome. Try making a custom channel grouping, splitting up branded and non-branded search terms and/or traffic. And check the source/medium report under Assisted conversions. Best feature of the new interface.

Real-time reports are not really useful. Only nice and funny to check, but it will not deliver a lot of insights (yet). I'm waiting on the day Google will allow segmenting real-time stats!

I don't think the title suits the article well. You're talking specifically about the AdWords keyword tool, which is known for (at least to me) not giving exact numbers or all keywords. You can use it for a rough estimation and for some ideas, but indeed don't focus blindly on the tool (at least not as the only source).

However, running an AdWords campaign to discover the search volumes and real keywords usage is ofcourse the best method to define keywords. Remember that buying broad keywords and checking the real keywords will only show keywords which lead to clicks. If you want to know exact search volumes, make sure you also buy in exact keywords (short/ long tail). However, also these numbers may vary, as this depends on certain factors. Keep an eye on the impression share for this, to get a clue if your ads are always being shown.

Via Google AdWords it is not possible in the exact way you mention, but you can set up a Google Display Network campaign to target web pages which mentions the keywords you name.For example: if you want to let your text ads and display ad appear on people who are interested in "seo power tools", make a campaign (watch the configuration options: target only Google Display Network, on all relevant pages across the network), and a descriptive, relevant Ad Group. Place in this Ad Group those keywords and put the ads, targeted at those keywords, in this Ad Group.You can make different Ad Groups this way, targeting certain keywords at web pages. You can imagine those web pages could be found by those keyword prhases in Google. Even though, you can also tell Google which sites you want to target, for example the top 10 sites on those keyword. If you place domain URL's _AND_ keywords in an Ad Group, Google will only place your ads on those pages of those sites which mentions the keywords (or are relevant to it).PPC is a whole different game. I've seen lots of people and companies loose money, lots of it, by setting up crappy campaigns..